CN101943598B - Calibration-free interchange method for belt scale instruments - Google Patents
Calibration-free interchange method for belt scale instruments Download PDFInfo
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- CN101943598B CN101943598B CN2010102210472A CN201010221047A CN101943598B CN 101943598 B CN101943598 B CN 101943598B CN 2010102210472 A CN2010102210472 A CN 2010102210472A CN 201010221047 A CN201010221047 A CN 201010221047A CN 101943598 B CN101943598 B CN 101943598B
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Abstract
The invention discloses a calibration-free interchange method for belt scale instruments, which can realize complete interchange of the belt scale instruments without calibration. The method mainly comprises the following steps of: comparing two loading points of the same standard weighing signal simulator before each belt scale instrument is delivered; measuring a coefficient k by the principle that two points determine a straight line, wherein the coefficient k is a total transformation coefficient of a weighing sensor signal by a bridge circuit and a gain circuit of the instrument; calculating a correction coefficient b according to a set standard transformation coefficient k'; and writing the correction coefficient b into a corresponding instrument. Therefore, the influence on the difference between the gains of the arch bridge and a preamplifier is eliminated and delivered instruments have completely the same characteristics.
Description
Technical field
The present invention relates to the measure control field, relate in particular to the method that a kind of belt conveyer scale instrument non-calibrating exchanges.
Background technology
Belt conveyer scale is that weigher and burden balance commonly used are gone up in industry.And in the use of belt conveyer scale, because site environment is abominable, perhaps artificially damage, it is always unavoidable to cause changing the belt conveyer scale instrument.Traditional belt scale instrument could be used after generally needing to demarcate once more when changing.In industry spot, belt conveyer scale demarcation itself is exactly harder thing, must stop various productions, must the labor manpower and materials, conflict toward contact and nervous rhythm of production.At the scene of large-scale belt conveyer scale, demarcate the major issue of dragging in many people especially, for example a flow is that 200T/h, speed are that 1m/s, Belt Length are the belt conveyer scale of 100m; Timing signal for the basic accuracy that guarantees to demarcate, need flow, the speed with 160T/h be 1m/s on belt at least; Operation 100m is above to be demarcated, and the quality of material is 4.44T on this 100m belt, and this must need on belt feeder, to adorn the material of 4.44T; In as the demarcation of this situation, often to use forklift, truck; Also need the higher weighbridge of precision etc., the material of these experiments of marquis sometimes can not be recycled, and causes the waste of material.Just because of that belt conveyer scale is demarcated is loaded down with trivial details, so the user generally is strict with the number of times of demarcation.
In traditional belt scale instrument design and in producing, generally do not consider the exchange fully of instrument, chief reason is a technical difficulty.Because accomplish the exchange fully of instrument, the design of hardware and software of instrument all had relatively high expectations.Realize the interchangeability of instrument, need satisfied following the requirement: put the consistance of performance before the weighing-up wave, promptly require to want on the software design to eliminate the difference that gain brought that supplies bridge and before put.
Summary of the invention
Technical matters to be solved by this invention is to overcome the difficult problem that prior art belt conveyer scale instrument can not non-calibrating be exchanged, but the method that provides a kind of belt conveyer scale instrument non-calibrating to exchange is greatly user-friendly.
The technical scheme that the present invention adopted is: the present invention includes following steps:
(1) for every belt conveyer scale instrument y=k * x+c is arranged all, wherein y is the AD value that obtains, and x is the load of LOAD CELLS, and c is a constant, and k is confession bridge and the gain circuitry of the instrument total conversion coefficient to load cell signal; Set a typical coefficient k '=k * b to all instrument, said typical coefficient k ' is a fixed constant;
(2) confirm a standard weighing-up wave simulator, all two POLs on the said standard weighing-up wave simulator are done contrast when every belt conveyer scale instrument is dispatched from the factory, measure total conversion coefficient k of this belt conveyer scale instrument;
(3) calculate the b value according to above-mentioned k '=k * b, said b value is write the total conversion coefficient k that makes in the corresponding belt conveyer scale instrument among the above-mentioned y=k * x+c of k ' value replacement.
Said total conversion coefficient k=a * V * A, wherein V is for supplying bridge voltage, and A is the gain coefficient of gain circuitry, and a is a conversion coefficient.
The temperature of the standard weighing-up wave simulator in said step (2) is floated less than 1ppm.
The temperature of in total conversion coefficient k process of measuring the belt conveyer scale instrument, demarcating the chamber is controlled at 20～28 degree.
Beneficial effect of the present invention is: but used the belt conveyer scale instrument of the present invention's non-calibrating exchange method; Eliminate the influence that supplies the bridge and the difference of the gain of before putting; Each item characteristic of every the instrument of dispatching from the factory is identical; Can realize the exchange fully of instrument cubicle, solve common belt conveyer scale instrument in the industrial processes and changed and need the loaded down with trivial details and inconvenience of demarcating again behind the table, greatly convenient for users to use; Wherein the temperature of standard weighing-up wave simulator is floated less than the 1ppm and the temperature of demarcating the chamber and is controlled at 20～28 degree, so this standard simulator of weighing can be approximately the ideal signal source, has guaranteed the weigh long-time stability of simulator of standard.
Embodiment
When the belt conveyer scale instrument of the inventive method is adopted in design, be to guarantee that different instrument all has same amplification effect, and possess the exchange fully that this condition just can realize non-calibrating.
Tool present principles of the present invention is following:
If y=k * x+c (1)
The AD value that y=obtains,
The load of x=LOAD CELLS,
The c=constant,
K be instrument confession bridge and gain circuitry to total conversion coefficient of load cell signal.
K can be defined as again
k＝a×V×A (2)
V=supplies bridge voltage,
The gain coefficient of A=gain circuitry,
The a=conversion coefficient.
Realize the exchange of instrument, will accomplish that total conversion coefficient k is consistent, this just requires to be standardized as a fixing constant to k.
The accurate total conversion coefficient of bidding is k ', the empirical constant of k ' for configuring,
K '=k * b then.
Typical coefficient k ' is a fixing constant, and k is every conversion characteristic that the belt conveyer scale instrument is intrinsic for not making the peaking variation factor before the standardization; B is a correction factor, is the coefficient that changes into k typical coefficient k ' usefulness.My every belt conveyer scale instrument of company all wants standardization, normalization to handle, and promptly confirms the b parameter.
b＝k′/k (3)
The method of its standardization is: when every belt conveyer scale instrument is dispatched from the factory, all will 2 POLs of same standard weighing-up wave simulator be contrasted, by 2 principles of confirming a straight line, measure k-factor earlier.According to k ' coefficient, calculate b again, write in the instrument and get final product with corresponding formula (3).This algorithm will guarantee the conversion accuracy more than 1/500000, to reduce unnecessary loss of significance.In addition, the simulator temperature of weighing of this standard in the said method is floated less than 1ppm, and the temperature of demarcating the chamber is controlled at 20～28 degree, so this standard simulator of weighing can be approximately the ideal signal source, has guaranteed the weigh long-time stability of simulator of standard.
With regard to concrete experimental data the present invention is described further below, relatively 4 belt conveyer scale instrument A1, A2 table and B1, B2 show, and A1 and A2 table are handled through the standardization calibration, and B1 and B2 table do not have standardization.Be to guarantee the experiment comparability, earlier A1 table and B1 table to same belt conveyer scale, do verification with same link code, make them that same weighing accuracy arranged, it gets respectively its tare weight and calibration coefficient respectively.Copy to the tare weight of A1, B1 and calibration coefficient respectively in A2, the B2 instrument again, and do the link code experiment of 10kg and 20Kg equally.Table explanation specific as follows:
Can know that by last table for the A1 that does standardization and A2 table, in the experiment of 20Kg link code, error is merely 1/10000, the least error that requires much smaller than the full accuracy of belt conveyer scale GB.Therefore A1 table and A2 table can be accomplished fully and exchange and non-calibrating.
And the B1 and the B2 that do not do standardization show, though the same tare weight value and calibration coefficient are arranged, in the experiment of 20Kg link code, error is 2.65%, and such error is unacceptable in the higher occasion of precision prescribed, so they can not simply exchange.
Claims (3)
1. the method that belt conveyer scale instrument non-calibrating exchanges is characterized in that, may further comprise the steps:
(1) for every belt conveyer scale instrument y=k * x+c is arranged all, wherein y is the AD value that obtains, and x is the load of LOAD CELLS, and c is a constant, and k is confession bridge and the gain circuitry of the instrument total conversion coefficient to load cell signal; Set a typical coefficient k '=k * b to all instrument, said typical coefficient k ' is a fixed constant;
(2) confirm a standard weighing-up wave simulator, all two POLs on the said standard weighing-up wave simulator are done contrast when every belt conveyer scale instrument is dispatched from the factory, measure total conversion coefficient k of this belt conveyer scale instrument;
(3) calculate the b value according to above-mentioned k '=k * b, said b value is write the total conversion coefficient k that makes in the corresponding belt conveyer scale instrument among the above-mentioned y=k * x+c of k ' value replacement.
2. the method that a kind of belt conveyer scale instrument non-calibrating according to claim 1 exchanges is characterized in that, said total conversion coefficient k=a * V * A, and wherein V is for supplying bridge voltage, and A is the gain coefficient of gain circuitry, and a is a conversion coefficient.
3. the method that a kind of belt conveyer scale instrument non-calibrating according to claim 1 and 2 exchanges is characterized in that the temperature of the standard weighing-up wave simulator in said step (2) is floated less than 1ppm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102210472A CN101943598B (en) | 2010-07-08 | 2010-07-08 | Calibration-free interchange method for belt scale instruments |
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| CN2010102210472A CN101943598B (en) | 2010-07-08 | 2010-07-08 | Calibration-free interchange method for belt scale instruments |
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| CN101943598B true CN101943598B (en) | 2012-02-15 |
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| CN109900348A (en) * | 2017-12-08 | 2019-06-18 | 奥豪斯仪器（常州）有限公司 | A kind of method that instrument and scale body arbitrarily match combination |
| CN109916496B (en) * | 2019-04-11 | 2020-01-24 | 深圳市深信信息技术有限公司 | Monitoring method and system of electronic scale |
| CN114910152B (en) * | 2022-05-30 | 2024-03-12 | 江西众加利高科技股份有限公司 | Precision correction method for weighing metering instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3206061C1 (en) * | 1982-02-19 | 1983-05-05 | Yamato Scale Co. Ltd., Akashi, Hyogo | Device for the automatic, weight-dependent sorting of objects |
| CN87202731U (en) * | 1987-02-28 | 1988-05-25 | 南京第二钢铁厂 | Auto corrector for leather belt weigh |
| DE29808236U1 (en) * | 1998-05-07 | 1998-07-30 | Riehle Bäckereigerätefabrik GmbH, 73479 Ellwangen | Device for the program-controlled compilation of mixtures of free-flowing bulk goods, in particular food ingredients |
| CN101046406A (en) * | 2006-03-28 | 2007-10-03 | 铜陵市三爱思电子有限公司 | On-line belt balance checking process and portable checking device |
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